Jul 24 – 30, 2016
Highfield Campus, University of Southampton
Europe/London timezone

Complex spectrum of spin models for finite-density QCD

Jul 27, 2016, 10:20 AM
Building 32 Room 1015 (Highfield Campus, University of Southampton)

Building 32 Room 1015

Highfield Campus, University of Southampton

Talk Nonzero Temperature and Density Nonzero Temperature and Density


Dr Hiromichi Nishimura (RIKEN BNL Research Center)


We consider the spectrum of transfer matrix eigenvalues associated with Polyakov loops in lattice QCD at strong coupling. The transfer matrix at finite density is non-Hermitian, and its eigenvalues become complex as a manifestation of the sign problem. We show that the symmetry under charge and complex conjugations ensures that the eigenvalues are either real or part of a complex conjugate pair, and the complex pairs lead to damped oscillatory behavior in Polyakov loop correlation functions, which also appeared in our previous phenomenological models using complex saddle points. We argue that the results reflect oscillatory behavior in color-charge densities and it should be observable in lattice simulations of QCD at finite density.

Primary authors

Dr Hiromichi Nishimura (RIKEN BNL Research Center) Mr Kamal Pangeni (Washington University in St. Louis) Prof. Mike Ogilvie (Washington University in St. Louis)

Presentation materials